fluorine fluorindine • fluorite · · · Info · Definitions · Synonyms · Characters · · fluorine · · Text Latin · · Script 8 · · Length Definitions · · · (noun) a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite. Synonyms: F, atomic number 9. · · Noun Definition 1 Synonyms · · · f · · Synonym 1 atomic number 9 · · Synonym 2 Characters · · e latin small letter e U+0065 f latin small letter f U+0066 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 u latin small letter u U+0075